Anchor-jack.



E. L. HOPKINS.

- ANCHOR JACK.

APPLICATION FILED AUG.3I,19II- RENEWED JAN. 10.1913.

1 ,240,2 1 G Patented Sept. 18, 191?.

witwaoo'ao I v g Homing .UNTTEE %TATES PATENT @FFTQE.

EDWARD L. HOPKINS, F COLUMBUS, OHIO, ASSIGNOR TO THE JEFFREY MANUFAC- TUBING COMPANY, A. CORPORATION OF OHIO.

ANCHOR-JACK.

Patented dept. 18, 1917..

Application filed August 31, 1911, Serial No. 646,986. Renewed January 10, 1913. Serial No. 741,350.

To all whom it may concern:

Be it known that-I, EDWARD L. Hor- KINS, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Anchor-' Jacks, of which the following is a specification, reference being had therein to the.

anchored to the shoe independent of the extensible upright or the pivoting bolts and yet the line of tension passes directly through the pivot point.

Previous to this an end of a cable was at-- tached to the upright post near its point of pivot or to the bolt upon which the upright post and the shoe are pivoted. Ob-

viously when the cable is attached to the post above the pivot point there is considerable tendency for' the post to bend and when attached to the pivot bolt induces a shearing stress to which this member should not be subjected. A particular advantage of the present construction is that both of these objectionable features are eliminated and the end of the cable is attached to the shoe independently of the upright and the pivot bolt therefor. Preferably, it is attached to an upright fin cast integrally with the shoe and so located that the line of tension passes through the pivot point, thereby giving the desired wedging efiect to the two members without subjecting the post to bending stresses or the bolt to shear.

Referring to the drawings; Figure 1 is a side elevation of the anchor jack with the central portion of the upright post cut away;

Fig. 2 is an end elevation of the lower portion of the anchor jack;

Fig. 3 is a perspective view of the forked lower extremity of the upright post; and Fig. d is a perspective view of the shoe. Inthe drawings, the numeral 1 represents a flat rectangular shoe upon the upper surface of which are formed at its outer edges two upright lugs-2. A forked end piece 3 is fastened to the lower end of .the tubular upright post 1, the prongs 5 of the end piece 3 being spread to a sullicient width to fit within the upstanding lugs 2. Bolt holes 6 are formed in the lower ends of the prongs 5 to register with the bolt holes 7 in the upper ends of the upstanding lugs 2. Shoulders 8 are provided on the outer faces of the prongs 5 and are adapted to bear against the upper ends of the lugs 2. The holes 6 and '7 in the lugs and prongs are made sufficiently large as compared to the size of the bolts or rivets which pass through them, so that the shoulders will bear down against the tops of the lugs and receive all the downward pressure instead of subjecting the bolts 9 to shear.

A rotatable collar 1O is mounted on the upper end of the post fl: and is provided with outward extending handles 11 by which the collar rotated, thereby extending the threaded rod 12. This means for extending the upright member may be of any suitable form, the one illustrated being a well known type.

An upright fin 13 is formed integrally with the base of the shoe 1 and located halfway between the two lugs 2. A hook-shaped nose 1%: is formed on its upper end, the center of the cut-out portion being located directly in line with the hole 7 of the lugs. The hook is so shaped that an eye or a loop on an end of a feed cable 15 attached to a mining machine may he slipped over its end and when pulled upon will bring the line of tension directly through the pivot point between the shoe and the upright. The location of the tension member may vary through a considerable angle in a vertical plane and still pass through this pivot point.

it will be observed that the line of tension not only passes approximately through the axis of the pivot, but also that the point of cable attachn'ient is approximately in the vertical plane of the pivotal axis. In other words, the point of cable attachment is approximately in the axis of the pivot. This arrangement insures that the line of tension shall pass approximately through the pivot point not only when the cable is horizontal, as shown, but also when it is inclined upward or downward. It will be seen that if the cable were to be inclined upward away from the shoe, and if the point of attachment were positioned otherwise than as shown, there would be a tendency for the cable to hitv up and bend tire part of the shoe to which it mightbe attached. i ith whilea single hook is shown, the invention in its, broader aspects is not limited to this construction, and that other means tor at taching the cable may be used,

Another important feature of this con struction is that the tension is transmitted directly to the shoe by means of in 13. This, in conjunction with "the shoulders 8 of the fork of the upright, renders it possible to subject the jack to severe strains without causing injury to the pivotal eon necti'on between the upright and the shoe. This result is of importance as, to insure proper working of the jack, the prig ht should be in condition to turn easily on lts pivots so as to align properly and accurately with the shoe. Obvious any injury to the pivots 9 would prevent this, and it is the main object of this invention to avoid such injury by providin a jack so constructed as to relieve the pivotal connection between the upright an the shoe of all strains and stresses due to the heavy work to which jacks oi this character are subjected.

While I have referred to the use of this anchor as particularly adapted for anchon ing the end of a mining machine teed cable, it is obvious that it may be used in a great variety of ways where it is desired to anchor theend of a tension member between two walls or supports between whicl'rthjack may be expanded.

lVhat I claim is:

1. In an anchor jack, a shoe, and an upright horizontally piv ted to the shoe, the shoe having means adapted to be connected with a cable and to receive the tension thereof at a point approximately in th vertical plane of the axis of the said pivot, aid means being independent of the pivotal. connection between the shoe and the upright.

2. In an anchor jack, a shoe, an upright horizontally pivoted to the shoe, lin carried by the shoe and acapted to be attached to a cable end and having its point of cable Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents tending lugs at eacn sine or engagement approximately at the point of intersection of the pivotal axis and the longitudinal axis'ot the said upright.

3. In an anchor jack, the combination of a shoe an upright, a forked end piece carried by said upright and pivotally connected to the shoe, the said end piece being provided with lateral shoulders in engagement with the shoe in all op rative positions of the up right, and means for attaching a'cable to said shoe, said means being independent 01 the pivotal connection between the forked end piece and ti e slice. I

4:. In. an anchor jack, the combination of a shoe provided with integral lugs having bolt holes andlaterally projecting shoulders concentric with said holes, an upright, a

iorhed end piece secured to said upright and loosely pivoted to said lugs,'said end piece being provided on its pron witl shoulders in engagement with the aforementioned shoulders of he said lugs to transmit to the latter the thrust of the upright, and means for attaching a cable to the shoe independently of the pivotal connectionbetweenthe upright and the shoe.

in nchor jack, shoe, uprightexhe shoe, an nsion on the upright post, a for ed ex" loi er end of the post, the two prongs of said fork being pivoted to the lugs of the shoe, a central {in it ned on the shoe, and a hook at the upper oi the i adapted to be engaged by tension member, the hook being so located that the line of tension passes through the pivot point.

(3. In an anchor jack, a shoe, upright extend ng lugs at each side of the shoe, an upright post, a forked extension on the lower end of the pres, the two prongs of said tori; being to the lugs of the shoe, a central fin. tori ed'on the shoe, and means on the upper end of the tin hair-cinching a tension in: oer thcretmthe tensionnwinber the , ging he being so located tha oi: tension passes through the in test oony whereof. I a T. in presence of two witnesses.

EDEVARD L. HQPKINS.

l i itnesses A. Fonrnssn, V Donner 'l. Foo-inn.

Washington, D. C. 

